Improvement in electro-magnetic sewing-machines



2 Sheets-Sheet l.

G. STEVENS & J. HENDY. ELECTROMAGNETIC SEWING MACHINE.

N0.111,488. Patented Jan.31, 1871.

Shae/k N 1.

2 5heats-Sheet 2.

G. STEVENS & J. HENDY.

ELECTROMAGNETIC SEWING MACHINE.

No. 111,488. Patented Jan. 31, 1871.

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l t F l UNITED STATES PATENT OFFICE.

GEORGE STEVENS AND JOSHUA HENDY, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN ELECTRO-MAGNETIC SEWING-MACHINES.

Specification forming part of Letters Patent No. 1|,48S, dated January81, 1871.

To all whom it may concern;

Be it known that we, GEORGE SrEvENs and JOSHUA HENDY, of the city audcounty of San Francisco, State. of (ialifoinia, have invented anElectroMagnetic Sewing-Machine; and we do hereby declare the followingdescription and accompanying drawings are sutficien-t to enable anyperson skilled in the art or science to which it most nearly appertainsto make and use our said invention or improvement-swithout furtherinvention or experiment.

Our invention relates to an improved methodot'drivings sewing-machines;audit consists in a novel arrangement of apparatus which forms .theelectro-motor, by which greater power is attained from the coils.

It also consists in a device for regulating the power and speed of themachine, which is very important as it brings it completely undercontrol.

The invention alto consists in constructing the machine so that theneedlc'bar is driven directly from the armatures or coils without theintervention ofcranks or wheels ofany sort.

Referring to the accompanyiu g drawin gs for a more complete explanationof our invention, A is a base-board, conveniently arranged to supportthe apparatus; or it might be placed directly upon the table of thesewing-machine, if more convenient. Two pairs of coils, B and O, areplaced upon this board, standing vertically, and far enough apart toadmit an oscillating beam, D, between the pairs. This beam is balancedso that the magnets or armatures of one pair'of coils are attached toone end and those of the other pair to the other end. The coils areconstructed, as shown in Sheet 2, Fig. 8, with an iron cylinderinclosing them, this form giving greater power to the magnets with agiven length of wire. Outside the cylinder another coil may be placed,and a cylinder outside this, alternating; but the additional power afterthe first cylinder is not in the same position.

The magnets b and c are made, as usual, of soft iron, and each pair ofbars are united at the top by a plate, d; or they may be formed inone'piece, as an ordinary U-magnet. The magnets extend down into thecoil about twothirds of their depth, and the armaturesf rise from thebottom about one-third of the height of the coil, this constructionadding greatly to their power.

The oscillating beam D has one end connected to each of the plates (1,and from some convenient point in its length the needle-bar E arises andextends forward to the table of the sewingmachine, over which the workpasses.

From the center of the beam I) an arm, F, depends, and as the beamoscillates the bar vibrates from side to side, striking alternately thepins on and it. These pins are fastened to a vibrating bar, i, which ispivoted at the bottom, and which is caused to move from side to side,thus alternately forming and breaking contact with the two pole-changersg and h. This causes the pairs of coils B and U to act alternately, andby them the magnets, with the beam D and the needle-bar, arecaused tomove. By means of a connecting-rod, V, the feed-inotion may also beoperated.

In order to regulate and vary the power so as tohave it completely undercontrol, one pole of the battery is connected with the cup 0 and theother extreme connects with the cup 1). Between the extremes of thebattery one or more wires lead outat different points and connect ill.cups, as at r. A switch, S, is so placed that by connecting it with oneof the buttons t the whole power of the battery will be employed, and byconnecting it with an other a less power will be used. The wires arearranged in any of the well-known modes, as partially indicated indotted lines on Fig. 2.

Although but three'cups are shown for the connections, yet it will bemanifest that any number may be employed to suit convenience.

In the arrangement of the coils, also, if it were desired, more than onepair might be connected with each end ofthe oscillating bar, but we havefound one pair sufiicient with our improved manner of constructing them.

The manner of constructing the pole-changers may be much varied withoutmaterial difference in the result.

Having thus described our invention, what we claim, and desire to secureby Letters Pat out, is--- 2 IILASS 1. Constructing the machine so that.the nee- In witness that the above-described invendle-bur shall beoperated directly from the election is claimed by us we have hereuntoset 0111 tro-magnets, either with or without the interhands and seals.

vention of levers, so that the oscillation of the armatures between twoor more electro-mag- GEORGE STEVENS. [L. 8.] nets shall cause asiinildrmovement to the JOSHUA HENDY. [L. 3.]

needle.

2. In an electromagnetic sewing-machine, Witnesses: the cups 0 p randswitch s, connected with the M. MEAGHER, battery, so as to vary thepower, substantially V. CUSHING.

as herein specified.

